Geriatric depression is strictly a psychiatric disorder with first onset after the age of 60, with persistent depressed mood as the main clinical manifestation. Mood disorders cannot be attributed to somatic or organic brain diseases. Depression is a negative, unpleasant emotional experience, characterized by low affect, crying, sadness, disappointment, reduced mobility, and delayed cognitive function of thinking. Features of geriatric depression 1. Hypochondriacal: i.e. suspicious symptoms. It is manifested as somatic symptoms dominated by autonomic symptoms. About 1/3 of geriatric patients have hypochondriasis as the first symptom of depression, and the content of hypochondriasis often involves digestive system symptoms, especially constipation and gastrointestinal discomfort is one of the most common and early symptoms of such patients. Patients often start with one of the less serious somatic diseases, so excessive attention to normal somatic functions and overreaction to mild diseases should be taken into consideration for geriatric depression. 2. Agitated: i.e., anxious and agitated. Agitated depression increases with age, and anxiety agitation is often a secondary symptom of more severe depression, and may also become the patient’s main symptom. The symptoms are anxiety and fear, fear of misfortune and disaster for oneself and family, rubbing hands and feet, restlessness, and fearfulness. The patient may have insomnia at night, or repeatedly reminisce about unpleasant events in the past, blaming himself for the misfortunes of his family and others, feeling sorry for his loved ones, and having no interest in anything in the environment. In mild cases, the person will talk endlessly about his or her experience and “miserable situation” and seek a safe person or place, while in severe cases, the person will strangle, electrocute, tear clothes, pull hair, roll all over the floor, feel anxious, and even attempt suicide. 3, insidious: that is, somatic symptomatization. Many elderly patients who deny depression show a variety of physical symptoms, and mood disorders are easily ignored by family members, until the elderly are found to have suicide attempts or behavior to psychiatric consultation. Because their depressive symptoms are masked by physical symptoms, they are called “occult depression”. 4.Hysteretic: that is, the behavioral block of depression. It is usually characterized by the lack and slowing of casual movement, affecting physical and somatic activities, and is accompanied by reduced facial expressions and speech block. Most elderly depressed patients show sullenness, sadness, lack of interest, slow thinking, often do not respond immediately to questions, repeatedly asked, only to reply with short and weak words, thinking content is poor. The patient spends most of the time in a state of silence, with delayed behavior. In severe cases, the patient’s eyes are staring, his emotions are indifferent, and he is indifferent to external movements. Behavioral blockade in depression has a consistent relationship with slow mental processes.